drivers/video/backlight/ili9320.c - maze/linux - Git at Google

 /* drivers/video/backlight/ili9320.c
  *
  * ILI9320 LCD controller driver core.
  *
  * Copyright 2007 Simtec Electronics
  *	http://armlinux.simtec.co.uk/
  *	Ben Dooks <ben@simtec.co.uk>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
 */

 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/fb.h>
 #include <linux/init.h>
 #include <linux/lcd.h>
 #include <linux/module.h>
 #include <linux/slab.h>

 #include <linux/spi/spi.h>

 #include <video/ili9320.h>

 #include "ili9320.h"


 static inline int ili9320_write_spi(struct ili9320 *ili,
 				    unsigned int reg,
 				    unsigned int value)
 {
 	struct ili9320_spi *spi = &ili->access.spi;
 	unsigned char *addr = spi->buffer_addr;
 	unsigned char *data = spi->buffer_data;

 	/* spi message consits of:
 	 * first byte: ID and operation
 	 */

 	addr[0] = spi->id | ILI9320_SPI_INDEX | ILI9320_SPI_WRITE;
 	addr[1] = reg >> 8;
 	addr[2] = reg;

 	/* second message is the data to transfer */

 	data[0] = spi->id | ILI9320_SPI_DATA  | ILI9320_SPI_WRITE;
 	data[1] = value >> 8;
 	data[2] = value;

 	return spi_sync(spi->dev, &spi->message);
 }

 int ili9320_write(struct ili9320 *ili, unsigned int reg, unsigned int value)
 {
 	dev_dbg(ili->dev, "write: reg=%02x, val=%04x\n", reg, value);
 	return ili->write(ili, reg, value);
 }
 EXPORT_SYMBOL_GPL(ili9320_write);

 int ili9320_write_regs(struct ili9320 *ili,
 		       const struct ili9320_reg *values,
 		       int nr_values)
 {
 	int index;
 	int ret;

 	for (index = 0; index < nr_values; index++, values++) {
 		ret = ili9320_write(ili, values->address, values->value);
 		if (ret != 0)
 			return ret;
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(ili9320_write_regs);

 static void ili9320_reset(struct ili9320 *lcd)
 {
 	struct ili9320_platdata *cfg = lcd->platdata;

 	cfg->reset(1);
 	mdelay(50);

 	cfg->reset(0);
 	mdelay(50);

 	cfg->reset(1);
 	mdelay(100);
 }

 static inline int ili9320_init_chip(struct ili9320 *lcd)
 {
 	int ret;

 	ili9320_reset(lcd);

 	ret = lcd->client->init(lcd, lcd->platdata);
 	if (ret != 0) {
 		dev_err(lcd->dev, "failed to initialise display\n");
 		return ret;
 	}

 	lcd->initialised = 1;
 	return 0;
 }

 static inline int ili9320_power_on(struct ili9320 *lcd)
 {
 	if (!lcd->initialised)
 		ili9320_init_chip(lcd);

 	lcd->display1 |= (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
 	ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);

 	return 0;
 }

 static inline int ili9320_power_off(struct ili9320 *lcd)
 {
 	lcd->display1 &= ~(ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
 	ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);

 	return 0;
 }

 #define POWER_IS_ON(pwr)	((pwr) <= FB_BLANK_NORMAL)

 static int ili9320_power(struct ili9320 *lcd, int power)
 {
 	int ret = 0;

 	dev_dbg(lcd->dev, "power %d => %d\n", lcd->power, power);

 	if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
 		ret = ili9320_power_on(lcd);
 	else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
 		ret = ili9320_power_off(lcd);

 	if (ret == 0)
 		lcd->power = power;
 	else
 		dev_warn(lcd->dev, "failed to set power mode %d\n", power);

 	return ret;
 }

 static inline struct ili9320 *to_our_lcd(struct lcd_device *lcd)
 {
 	return lcd_get_data(lcd);
 }

 static int ili9320_set_power(struct lcd_device *ld, int power)
 {
 	struct ili9320 *lcd = to_our_lcd(ld);

 	return ili9320_power(lcd, power);
 }

 static int ili9320_get_power(struct lcd_device *ld)
 {
 	struct ili9320 *lcd = to_our_lcd(ld);

 	return lcd->power;
 }

 static struct lcd_ops ili9320_ops = {
 	.get_power	= ili9320_get_power,
 	.set_power	= ili9320_set_power,
 };

 static void ili9320_setup_spi(struct ili9320 *ili,
 					struct spi_device *dev)
 {
 	struct ili9320_spi *spi = &ili->access.spi;

 	ili->write = ili9320_write_spi;
 	spi->dev = dev;

 	/* fill the two messages we are going to use to send the data
 	 * with, the first the address followed by the data. The datasheet
 	 * says they should be done as two distinct cycles of the SPI CS line.
 	 */

 	spi->xfer[0].tx_buf = spi->buffer_addr;
 	spi->xfer[1].tx_buf = spi->buffer_data;
 	spi->xfer[0].len = 3;
 	spi->xfer[1].len = 3;
 	spi->xfer[0].bits_per_word = 8;
 	spi->xfer[1].bits_per_word = 8;
 	spi->xfer[0].cs_change = 1;

 	spi_message_init(&spi->message);
 	spi_message_add_tail(&spi->xfer[0], &spi->message);
 	spi_message_add_tail(&spi->xfer[1], &spi->message);
 }

 int ili9320_probe_spi(struct spi_device *spi,
 				struct ili9320_client *client)
 {
 	struct ili9320_platdata *cfg = spi->dev.platform_data;
 	struct device *dev = &spi->dev;
 	struct ili9320 *ili;
 	struct lcd_device *lcd;
 	int ret = 0;

 	/* verify we where given some information */

 	if (cfg == NULL) {
 		dev_err(dev, "no platform data supplied\n");
 		return -EINVAL;
 	}

 	if (cfg->hsize <= 0 || cfg->vsize <= 0 || cfg->reset == NULL) {
 		dev_err(dev, "invalid platform data supplied\n");
 		return -EINVAL;
 	}

 	/* allocate and initialse our state */

 	ili = devm_kzalloc(&spi->dev, sizeof(struct ili9320), GFP_KERNEL);
 	if (ili == NULL) {
 		dev_err(dev, "no memory for device\n");
 		return -ENOMEM;
 	}

 	ili->access.spi.id = ILI9320_SPI_IDCODE | ILI9320_SPI_ID(1);

 	ili->dev = dev;
 	ili->client = client;
 	ili->power = FB_BLANK_POWERDOWN;
 	ili->platdata = cfg;

 	spi_set_drvdata(spi, ili);

 	ili9320_setup_spi(ili, spi);

 	lcd = lcd_device_register("ili9320", dev, ili, &ili9320_ops);
 	if (IS_ERR(lcd)) {
 		dev_err(dev, "failed to register lcd device\n");
 		return PTR_ERR(lcd);
 	}

 	ili->lcd = lcd;

 	dev_info(dev, "initialising %s\n", client->name);

 	ret = ili9320_power(ili, FB_BLANK_UNBLANK);
 	if (ret != 0) {
 		dev_err(dev, "failed to set lcd power state\n");
 		goto err_unregister;
 	}

 	return 0;

  err_unregister:
 	lcd_device_unregister(lcd);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(ili9320_probe_spi);

 int ili9320_remove(struct ili9320 *ili)
 {
 	ili9320_power(ili, FB_BLANK_POWERDOWN);

 	lcd_device_unregister(ili->lcd);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(ili9320_remove);

 #ifdef CONFIG_PM_SLEEP
 int ili9320_suspend(struct ili9320 *lcd)
 {
 	int ret;

 	ret = ili9320_power(lcd, FB_BLANK_POWERDOWN);

 	if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
 		ili9320_write(lcd, ILI9320_POWER1, lcd->power1 |
 			      ILI9320_POWER1_SLP |
 			      ILI9320_POWER1_DSTB);
 		lcd->initialised = 0;
 	}

 	return ret;
 }
 EXPORT_SYMBOL_GPL(ili9320_suspend);

 int ili9320_resume(struct ili9320 *lcd)
 {
 	dev_info(lcd->dev, "resuming from power state %d\n", lcd->power);

 	if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP)
 		ili9320_write(lcd, ILI9320_POWER1, 0x00);

 	return ili9320_power(lcd, FB_BLANK_UNBLANK);
 }
 EXPORT_SYMBOL_GPL(ili9320_resume);
 #endif

 /* Power down all displays on reboot, poweroff or halt */
 void ili9320_shutdown(struct ili9320 *lcd)
 {
 	ili9320_power(lcd, FB_BLANK_POWERDOWN);
 }
 EXPORT_SYMBOL_GPL(ili9320_shutdown);

 MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
 MODULE_DESCRIPTION("ILI9320 LCD Driver");
 MODULE_LICENSE("GPL v2");
	/* drivers/video/backlight/ili9320.c
	*
	* ILI9320 LCD controller driver core.
	*
	* Copyright 2007 Simtec Electronics
	* http://armlinux.simtec.co.uk/
	* Ben Dooks <ben@simtec.co.uk>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/fb.h>
	#include <linux/init.h>
	#include <linux/lcd.h>
	#include <linux/module.h>
	#include <linux/slab.h>

	#include <linux/spi/spi.h>

	#include <video/ili9320.h>

	#include "ili9320.h"


	static inline int ili9320_write_spi(struct ili9320 *ili,
	unsigned int reg,
	unsigned int value)
	{
	struct ili9320_spi *spi = &ili->access.spi;
	unsigned char *addr = spi->buffer_addr;
	unsigned char *data = spi->buffer_data;

	/* spi message consits of:
	* first byte: ID and operation
	*/

	addr[0] = spi->id \| ILI9320_SPI_INDEX \| ILI9320_SPI_WRITE;
	addr[1] = reg >> 8;
	addr[2] = reg;

	/* second message is the data to transfer */

	data[0] = spi->id \| ILI9320_SPI_DATA \| ILI9320_SPI_WRITE;
	data[1] = value >> 8;
	data[2] = value;

	return spi_sync(spi->dev, &spi->message);
	}

	int ili9320_write(struct ili9320 *ili, unsigned int reg, unsigned int value)
	{
	dev_dbg(ili->dev, "write: reg=%02x, val=%04x\n", reg, value);
	return ili->write(ili, reg, value);
	}
	EXPORT_SYMBOL_GPL(ili9320_write);

	int ili9320_write_regs(struct ili9320 *ili,
	const struct ili9320_reg *values,
	int nr_values)
	{
	int index;
	int ret;

	for (index = 0; index < nr_values; index++, values++) {
	ret = ili9320_write(ili, values->address, values->value);
	if (ret != 0)
	return ret;
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(ili9320_write_regs);

	static void ili9320_reset(struct ili9320 *lcd)
	{
	struct ili9320_platdata *cfg = lcd->platdata;

	cfg->reset(1);
	mdelay(50);

	cfg->reset(0);
	mdelay(50);

	cfg->reset(1);
	mdelay(100);
	}

	static inline int ili9320_init_chip(struct ili9320 *lcd)
	{
	int ret;

	ili9320_reset(lcd);

	ret = lcd->client->init(lcd, lcd->platdata);
	if (ret != 0) {
	dev_err(lcd->dev, "failed to initialise display\n");
	return ret;
	}

	lcd->initialised = 1;
	return 0;
	}

	static inline int ili9320_power_on(struct ili9320 *lcd)
	{
	if (!lcd->initialised)
	ili9320_init_chip(lcd);

	lcd->display1 \|= (ILI9320_DISPLAY1_D(3) \| ILI9320_DISPLAY1_BASEE);
	ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);

	return 0;
	}

	static inline int ili9320_power_off(struct ili9320 *lcd)
	{
	lcd->display1 &= ~(ILI9320_DISPLAY1_D(3) \| ILI9320_DISPLAY1_BASEE);
	ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);

	return 0;
	}

	#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)

	static int ili9320_power(struct ili9320 *lcd, int power)
	{
	int ret = 0;

	dev_dbg(lcd->dev, "power %d => %d\n", lcd->power, power);

	if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
	ret = ili9320_power_on(lcd);
	else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
	ret = ili9320_power_off(lcd);

	if (ret == 0)
	lcd->power = power;
	else
	dev_warn(lcd->dev, "failed to set power mode %d\n", power);

	return ret;
	}

	static inline struct ili9320 to_our_lcd(struct lcd_device lcd)
	{
	return lcd_get_data(lcd);
	}

	static int ili9320_set_power(struct lcd_device *ld, int power)
	{
	struct ili9320 *lcd = to_our_lcd(ld);

	return ili9320_power(lcd, power);
	}

	static int ili9320_get_power(struct lcd_device *ld)
	{
	struct ili9320 *lcd = to_our_lcd(ld);

	return lcd->power;
	}

	static struct lcd_ops ili9320_ops = {
	.get_power = ili9320_get_power,
	.set_power = ili9320_set_power,
	};

	static void ili9320_setup_spi(struct ili9320 *ili,
	struct spi_device *dev)
	{
	struct ili9320_spi *spi = &ili->access.spi;

	ili->write = ili9320_write_spi;
	spi->dev = dev;

	/* fill the two messages we are going to use to send the data
	* with, the first the address followed by the data. The datasheet
	* says they should be done as two distinct cycles of the SPI CS line.
	*/

	spi->xfer[0].tx_buf = spi->buffer_addr;
	spi->xfer[1].tx_buf = spi->buffer_data;
	spi->xfer[0].len = 3;
	spi->xfer[1].len = 3;
	spi->xfer[0].bits_per_word = 8;
	spi->xfer[1].bits_per_word = 8;
	spi->xfer[0].cs_change = 1;

	spi_message_init(&spi->message);
	spi_message_add_tail(&spi->xfer[0], &spi->message);
	spi_message_add_tail(&spi->xfer[1], &spi->message);
	}

	int ili9320_probe_spi(struct spi_device *spi,
	struct ili9320_client *client)
	{
	struct ili9320_platdata *cfg = spi->dev.platform_data;
	struct device *dev = &spi->dev;
	struct ili9320 *ili;
	struct lcd_device *lcd;
	int ret = 0;

	/* verify we where given some information */

	if (cfg == NULL) {
	dev_err(dev, "no platform data supplied\n");
	return -EINVAL;
	}

	if (cfg->hsize <= 0 \|\| cfg->vsize <= 0 \|\| cfg->reset == NULL) {
	dev_err(dev, "invalid platform data supplied\n");
	return -EINVAL;
	}

	/* allocate and initialse our state */

	ili = devm_kzalloc(&spi->dev, sizeof(struct ili9320), GFP_KERNEL);
	if (ili == NULL) {
	dev_err(dev, "no memory for device\n");
	return -ENOMEM;
	}

	ili->access.spi.id = ILI9320_SPI_IDCODE \| ILI9320_SPI_ID(1);

	ili->dev = dev;
	ili->client = client;
	ili->power = FB_BLANK_POWERDOWN;
	ili->platdata = cfg;

	spi_set_drvdata(spi, ili);

	ili9320_setup_spi(ili, spi);

	lcd = lcd_device_register("ili9320", dev, ili, &ili9320_ops);
	if (IS_ERR(lcd)) {
	dev_err(dev, "failed to register lcd device\n");
	return PTR_ERR(lcd);
	}

	ili->lcd = lcd;

	dev_info(dev, "initialising %s\n", client->name);

	ret = ili9320_power(ili, FB_BLANK_UNBLANK);
	if (ret != 0) {
	dev_err(dev, "failed to set lcd power state\n");
	goto err_unregister;
	}

	return 0;

	err_unregister:
	lcd_device_unregister(lcd);

	return ret;
	}
	EXPORT_SYMBOL_GPL(ili9320_probe_spi);

	int ili9320_remove(struct ili9320 *ili)
	{
	ili9320_power(ili, FB_BLANK_POWERDOWN);

	lcd_device_unregister(ili->lcd);

	return 0;
	}
	EXPORT_SYMBOL_GPL(ili9320_remove);

	#ifdef CONFIG_PM_SLEEP
	int ili9320_suspend(struct ili9320 *lcd)
	{
	int ret;

	ret = ili9320_power(lcd, FB_BLANK_POWERDOWN);

	if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
	ili9320_write(lcd, ILI9320_POWER1, lcd->power1 \|
	ILI9320_POWER1_SLP \|
	ILI9320_POWER1_DSTB);
	lcd->initialised = 0;
	}

	return ret;
	}
	EXPORT_SYMBOL_GPL(ili9320_suspend);

	int ili9320_resume(struct ili9320 *lcd)
	{
	dev_info(lcd->dev, "resuming from power state %d\n", lcd->power);

	if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP)
	ili9320_write(lcd, ILI9320_POWER1, 0x00);

	return ili9320_power(lcd, FB_BLANK_UNBLANK);
	}
	EXPORT_SYMBOL_GPL(ili9320_resume);
	#endif

	/* Power down all displays on reboot, poweroff or halt */
	void ili9320_shutdown(struct ili9320 *lcd)
	{
	ili9320_power(lcd, FB_BLANK_POWERDOWN);
	}
	EXPORT_SYMBOL_GPL(ili9320_shutdown);

	MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
	MODULE_DESCRIPTION("ILI9320 LCD Driver");
	MODULE_LICENSE("GPL v2");